The Hindu-Arabic Numerals c9.137

c9.137

¹ J. L. Heiberg places the book in the eleventh century on philological grounds, *Philologus*, loc. cit.; Woepcke, in *Propagation*, p. 44; Blume, Lachmann, and Rudorff, *Die Schriften der römischen Feldmesser*, Berlin, 1848; Boeckh, *De abaco graecorum*, Berlin, 1841; Friedlein, in his Leipzig edition of 1867; Weissenborn, *Abhandlungen*, Vol. II, p. 185, his *Gerbert*, pp. 1, 247, and his *Geschichte der Einführung der jetzigen Ziffern in Europa durch Gerbert*, Berlin, 1892, p. 11; Bayley, loc. cit., p. 59; Gerhardt, *Études*, p. 17, *Entstehung und Ausbreitung*, p. 14; Nagl, *Gerbert*, p. 57; Bubnov, loc. cit. See also the discussion by Chasles, Halliwell, and Libri, in the *Comptes rendus*, 1839, Vol. IX, p. 447, and in Vols. VIII, XVI, XVII of the same journal.